Method of waterproofing plaster using at least one alkylhydroperoxide and at least one hydrocolloid |
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IPC classes for russian patent Method of waterproofing plaster using at least one alkylhydroperoxide and at least one hydrocolloid (RU 2198856):
      
 Insulation material / 2102350
The invention relates to thermal insulation materials that can be used for thermal insulation of surfaces in various sectors of the national economy
 Composition for a protective and decorative coating of building products / 2093488
The invention relates to the field of building materials and is intended for use as coatings for protective and decorative finishes building products of concrete, asbestos cement, cement-bonded particleboards
 A method of manufacturing a layered product on the basis of silicate glass / 2084415
The invention relates to the method of manufacturing the layered product of the silicate glass, in particular, silicate triplexes, intended for glazing of vehicles and other purposes
 Complex additive for concrete mix / 2078744
 Polymer mixture for floors / 2076848
The invention relates to polymer mixtures for the device chemical resistant and impervious tile floors in industrial, civil and agricultural buildings
 Composition for coating / 2067086
The invention relates to the construction materials industry, in particular, compositions of coatings for building structures
 A method of manufacturing a construction finishes / 2055032
The invention relates to the construction, in particular for decorating
 The composition for decorating and cooking / 2047577
The invention relates to the construction and building materials, in particular to compositions and method for preparing them for decorative and protective coatings, mainly concrete, asbestos-cement and brick
 Raw mix for the production of wood-concrete materials and method of reception / 2194685
The invention relates to the field of construction and can be used in the manufacture of building materials for the construction of industrial and residential objects
 A method of manufacturing a wood-mineral plates / 2191761
The invention relates to the field of construction and can be used in the technology of wood-mineral plates
 Raw mix for wood-mineral building materials / 2191756
The invention relates to the construction materials industry, in particular to raw mixtures with wood filler, and can be used for construction of houses, commercial buildings, etc
Concrete mix / 2188803
The invention relates to the construction, in particular to the field of concrete structures
 Raw mix for the production of gypsum concrete / 2188176
The invention relates to building materials and can be used in the manufacture of lightweight gypsum blocks and structures
 Concrete mix / 2188175
The invention relates to the production of concrete products, decorative plates, road and pavement coatings
 The complex additive for concrete and mortars / 2187480
The invention relates to additive compositions for concrete mix, in particular additives that promote the production of concrete works at negative ambient temperatures, in particular for conservation in mixtures of liquid phase necessary for the hydration and hardening of cement paste during execution of works at temperatures from -1 to -55oWith
 A method of manufacturing a single-piece construction products / 2186750
The invention relates to the construction materials industry and can be used in the manufacture of wood-cement products
 Additive in concrete mix / 2186046
The invention relates to construction materials and can be used in concrete mixes for construction and laying of underground mining
Regulating additive for concrete and method of its manufacture / 2186045
The invention relates to the construction industry, and more specifically to concrete additives used to improve the properties of concrete, including concrete based on Portland cement clinker
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(57) Abstract: Describes a method of waterproofing plaster, namely, that to the powder plaster add at least one component (A) containing at least one alkylhydroperoxide, and at least one hydrocolloid (C) containing at least one galactomannan powdery composition comprising a hydrocolloid (B), the solid is based on at least one supported on a carrier component (A), a molded product in the form of sheets or plates, obtained from gidrofobizirovannogo plaster, and a product containing a component a containing at least one alkylhydroperoxide, and component (B) containing at least one galactomannan. The technical result is improved durability of the plaster to the water without changing its mechanical properties. 5 C. and 15 C.p. f-crystals, 2 tab. The present invention relates to a method of waterproofing plaster and plaster products. Plaster, with the chemical formula CaSO41/2H2Oh, is formed by calcination of natural or synthetic gypsum at a temperature of approximately 140oC. In that case, it is. If the annealing is performed at a pressure above atmospheric, receive plaster type . The calcination of gypsum (CaSO42H2O) at temperatures above 600oWith network anhydrite (CaSO4). There are also synthetic anhydrite, such as florangela. It should be noted that the anhydrite (SO4may also be of natural origin, for example in the form of rock. The calcium sulfate in palpitations or anhydrous form (plaster , and synthetic or natural anhydrite) when mixed with water or quenching can produce gypsum formula CaS42H2O. Gypsum is sensitive to water product having a solubility of approximately 2.0 g/l at 20oC. In the framework of the present invention, the term "plaster" means all of the above forms, which after rehydration give gypsum (S42H2O). In various applications of plaster to have a material with stable mechanical properties. It is also significant that the solidified material is maintained after contact with the humidity of their original properties (shape, color, etc). For this purpose, the plaster should be gidrofobizirovan, i.e., to make the need to handle the plaster on the surface and in the bulk. In the case of waterproofing in the mass processing of produce in situ during the manufacturing process covered by plaster products, usually by adding to the water shuts gidrofobizatsija connection. Use only alkylhydroperoxides for waterproofing plaster in the mass is already known. After hydrolysis of alkylhydroperoxides usually leads to the formation of hydrophobic alkylhydroperoxides nets. The main disadvantage of alkylhydroperoxides when they are used as water-repellent agent is that under certain operating conditions, namely at elevated temperatures (ranging from approximately 120oC), these compounds may be partially transformed into silica dust, which, due to its poroshkoobraznoe may create an obstacle to work means of transportation. This leads to a shutdown of the installation, causing thereby the expense of the production process. On the other hand, depending on the pH of the plaster, when the individual using alkylhydroperoxides as repellent may be more or less strong hydrogen gas, which creates security problems idut problems reuse containing plasters. Finally, you may encounter performance problems of waterproofing for individual use alkylhydroperoxides with some types of plaster, in particular with plaster synthetic origin. The main purpose of the present invention is to overcome the above disadvantages by applying the improved method of waterproofing plaster using a reduced number of alkylhydroperoxides that would allow to receive and retain a material whose sensitivity to the penetration of water would be significantly reduced and for a long time. These objectives are achieved in the present invention, which is the process of waterproofing plaster using alkylhydroperoxides and hydrocolloid. Under the process of "hydrophobicity plaster" refers to a process which makes plaster impervious to penetration of liquid water in the direction from the surface inward and in the direction from the inside to the surface of the plaster, while maintaining the permeability of the plaster to the water vapor in both directions. The subject of the invention is hydrophobization pieces the least one alkylhydroperoxide, and at least one hydrocolloid (C) containing at least one galactomannan. The method according to the present invention makes it also possible to easily reuse the treated plaster. Under certain conditions, you can also receive the above gidrofobizirovannogo plaster with unchanged or even improved mechanical properties. In addition, the method according to the present invention can give good hydrophobic properties even plasters synthetic origin. More specifically, the method according to the invention is mixed with powder of plaster at least one component (A) containing at least one alkylhydroperoxide at least one hydrocolloid (C) containing at least one galactomannan, and water. The first component used in the method according to the invention, a component (A) consisting of at least one alkylhydroperoxide. Alkylhydroperoxide (A) can be of different nature. They can be linear or cyclic or a mixture of linear and cyclic compounds, which are described by the General formulas I and II:< / BR> < / BR></ 0b500, mainly 1b100 5A+b1000, mainly 10A+b150 c and d are integers or fractional numbers, defined as S, mainly s 1d10, mainly 1d5 3c+d10, mostly 3C+d5 R1identical or different, represent monovalent hydrocarbon radical with 1-8 carbon atoms, chosen from: normal or branched alkyl radicals, in particular methyl radicals, ethyl, propyl, isopropyl, tert-butyl, n-hexyl, n-octyl; unsaturated phenyl radicals which can be substituted by methyl and/or ethyl radical; when b>0, R2identical or different, denote a hydrogen atom and/or a monovalent hydrocarbon radical with 1-8 carbon atoms, selected from normal or branched alkyl radicals, in particular methyl radicals, ethyl, propyl, isopropyl, tert-butyl, n-hexyl, n-octyl; unsaturated phenyl radicals which can be substituted by methyl and/or ethyl radical; when b= 0, at least one of the radicals R2is a hydrogen atom, while the remaining radicals R2identical or different, represent monovalent hydrocarbon radical with 1-8 atoms ug is Il, propyl, isopropyl, tert-butyl, n-hexyl, n-octyl; unsaturated phenyl radicals which can be substituted by methyl and/or ethyl radical. Component (A) consists mainly of at least one linear alkylhydroperoxide General formula I, in which the radicals R1and R2indicate a normal alkyl radicals containing 1-3 carbon atoms selected from the radicals methyl, ethyl and propyl, preferably methyl; a and b are integers or fractional numbers, defined as: 0a99, mainly a 1b100, mainly 10b80 10A+b150, mainly 20A+b100 The above component (A) consists of at least one alkylhydroperoxide, which can have a viscosity of not more than 200 mPas, and preferably from 5 to 50 mPas. Here is the statement viscosity determined using a BROOKFIELD viscometer at 25oC and 20 rpm An important parameter for determining alkylhydroperoxides (A) of the invention is the percentage of hydrogen radicals (parts of SiH). The best results are obtained with alkylhydroperoxide (A) with a predominant percentage of links SiH from 0.05 to 5 and the preferred (A) are usually oil. They can be used in pure form, diluted in an organic solvent, emulsion or in the form of powder in the case, when they are fixed on the powdery carrier. Alkylhydroperoxide (A) is used mainly in pure form, in the form of an aqueous emulsion or emulsified concentrates in the presence of suitable surface-active substances. Usually alkylhydroperoxide present in amount of at least 0.3 percent by weight of powder of plaster that provides hydrophobic properties required by the regulations in respect of waterproofing: water absorption <5% after 2 h immersion in water; water absorption <10% after 24 h immersion in water. The present invention allows to reduce the usual dose of alkylhydroperoxide (A) to the amount not exceeding 0.25%, and preferably not in excess of 0.15% by weight of powder of plaster, thus meeting the above standards. The second essential component used in the method of the invention is a hydrocolloid (b) consisting of at least one of galactomannan. The galactomannans are polysaccharides consisting of a sequence of monomial which the second resin is a natural hydrocolloid, deposited as reserve material in endosperm guar beans. At the same time it is galactomannans, which molecule has a very specific configuration. The skeleton of the molecule consists of a long chain of links mannose, interconnected 1,4--glycosidic bond. Statistically one molecule mannose of the two has as branching galactose, connected via communication 1,6-. Natural guar gum can be subjected to chemical modification, which allows to significantly change its properties, while maintaining its basic characteristics. Thus, the available hydroxyl groups of the guar resin can be overridden by using the esterification reaction or esterification, resulting in the formation, for example, carboxyaniline, hydroxyethylamine and phosphate derivatives. The esterification reaction and esterification in themselves known, in particular, in the chemistry of cellulose and starch. You can also replace the free hydroxyl groups of the guar resin with the aim of obtaining cationic and amphoteric guarav. In the framework of the present invention, the hydrocolloid (In) mainly chosen from nonionic of galactomannans, trocolod (C) is a nonionic guar gum, which at least part of the hydroxyl groups is substituted by hydroxyalkyl groups in which the alkyl group contains from 2 to 4 carbon atoms. These are the non-ionic guar, also called simple hydroxyalkylated esters guarav, can be selected from gidroxiatilkrahmal, hydroxypropylamino and hydroxybutyrate. (In) is mainly hydroxypropylamino. Simple hydroxyalkyl ethers of guar present invention can be obtained by known methods, for example the method described in canadian patent 1073727, in particular by reaction of the guar resin with acceleratedly, such as ethylene oxide, propylene oxide or butyleneglycol in the presence of a catalyst, such as hydroxides of alkali metals, such as NaOH, hydroxides of alkaline earth metals or ammonium hydroxide. The reaction may proceed at a temperature of from 15 to 130oC. Typically, each monomer mannose and/or galactose) in the guar resin may have an average of three hydroxyl functions capable of reacting with alkalization. Thus, the degree of molar substitution simple hydroxyalkyl ether polymer as a whole and simple hydroxyalkyl ether of guar in concr is alimera in General and guar specifically. The degree of molar substitution of hydrocolloid (C), in particular simple hydroxyalkyl ether of guar of the present invention, may range from 0.2 to 0.9 and preferably from 0.3 to 0.7. Srednevekovaja molecular weight (Mw) of hydrocolloid (C) can vary from 50,000 to 2000000, mostly from 200000 to 1500000. Srednevekovaja molecular weight (Mw) is expressed by the following formula: < / BR> where Nidenotes the number of moles of polymer type i, Midenotes the molecular weight of the polymer of type i. Hydrocolloid (In) usually exists in solid form. His introduction to this environment allows you to change the viscosity and rheological properties of this medium, depending on the desired specific requirements. So, for dispersion 1% hydrocolloid () in this environment, particularly in water, it is advantageous to have a viscosity of not more than 1500 mPas. The preferred viscosity is from 500 to 1100 mPas, for example, about 1000 mPas. The content of hydrocolloid (b) is from 0.05 to 0.5, preferably from 0.05 to 0.3, and even more preferably from 0.10 to 0.25% by weight of powder of plaster. From commercially available commercial products hydrocolloid () can nazval, JAGUAR 8200, JAGUAR 8801 and JAGUAR HP 8. Hydrophobization of plaster can be carried out using known methods, for example by mixing the powder of plaster, component (A) containing at least one alkylhydroperoxide, hydrocolloid (C) containing at least one galactomannan, and water. May, for example, be the following sequence of operations: i) pre-mix component (a) and hydrocolloid () shuts the water, ii) to enter into a pre-prepared mixture of plaster, iii) to give the plaster form and wait for the stiffening material, and iv) dry the plaster in a drying Cabinet to constant weight. Shuts the water may contain other additives (which can be entered and fresh pasta), in particular agents, thinning and dispersing plaster, and/or foaming agents. As vasospasm or dispersing agent can be called condensed phosphates, sodium tripolyphosphate, sodium hexametaphosphate, metrpole(meth)acrylates, atilola(meth)acrylate or sodium salt of poly(meth)acrylic acid, poly(meth)acrylic acid, amides of poly(meth)acrylic acid, organic postelectoral, sulfated polycondensate, such as sulfonated naphthaleneformaldehyde polycondensate, primality in acid form and/or as a salt of an alkali metal, tannins, lignins, glucosides, gluconate, alginates, esters of phosphoric acid and poststelle. These and other compounds described in the book "Kirk-Othmer, Encyclopedia of Chemical Technology, 3rd edition, T. 7, pp. 833-846", which is a part of the present description. As foaming agents can be called the group of surface-active substances such as sodium or ammonium salts of alkyl sulphates, sodium or ammonium salt of laurylsulfate, cocoamphodiacetate-diallylmalonate sodium, ethoxylated alcohols, ethoxylated fatty alcohols, sucrose glycerides, ethoxylated castor or copra oil and betaines. In particular, can be used a commercial wetting agents, for example, supplied by the company RHODIA RHIDASURF 860 R, RHOCAFOAM'AN 45, RHOCAFOAM 10 AMP, RHOCAFOAM AB 20, RHOXTMAT TG 80 and RHOCAFOAM'AN 30. As already mentioned, the hydrocolloid (B) is usually in solid form. Component (A) may be in the form of pure oil, diluted in a solution, in particular above emulsion or to be able to emulgirovanija concentrate the formation of emulsions in the event you enter into contact with water. In this case, the subject of the invention is a method of waterproofing plaster, characterized in that the add plaster composition containing at least one of the above hydrocolloid (C) containing at least one galactomannan in the solid state, and at least one component (A) containing at least one above-defined alkylhydroperoxide in the form of pure oil, diluted in solution, in emulsion or in the form capable of emulgirovanija concentrate. In the case when both components (a) and (b) are solid, pre-cooked mixture is a powder composition. As component (C) is usually in the solid state, problems associated with the component (A). As mentioned, the component (A) is typically oil. It gives a solid form, usually by soaking them non-solid mineral carrier such as silica, calcium carbonate, plaster (CaS41/2H2O), gypsum or any other inert mineral or organic filler. The impregnation is carried out in a known manner by reacting solid This operation is usually carried out, maintaining a solid carrier in a certain amount of the component (A) or a certain volume of a solution or emulsion containing the component (A). You can also be impregnated solid carrier, immersing it in a clean component (A) or a solution or emulsion containing the component (A), with the subsequent removal of excess solution by the method of splitting. Drawing on the carrier can also be produced directly by spraying pure component (A) or a solution or emulsion containing the component (A), on a carrier in the mixer, for example of the type Lodige or Forberg. Thus, the subject invention is a powdery composition containing at least one hydrocolloid (C) containing at least one defined above galactomannan, - solid substance on the basis of at least one supported on a carrier component (A) and component (A) contains at least one above-defined alkylhydroperoxide. The invention relates to molded articles having either the form of a sheet or plate form. These products are produced from plaster, exposed hydrophobization processing, which is described in the present description. Sharing is the use of two components (a) and (b) together to obtain the desired water-repellent action, and components (a) and (b) may be introduced into the plaster at the same time or separately. Listed below are the specific, but not limiting of the scope of the invention examples. Example 1 Equipment The following equipment is the same for all examples. It includes: - mixer Raineri and a four-bladed propeller used at a speed of 1200 rpm; form stainless steel for samples of size HH cm3; - 2-liter beaker made of polypropylene; - ventilated drying Cabinet KERAEUS type UP 6420. Materials Prepared four series of three specimens of plaster of 3600 g of natural plaster (S41/2H2O). Series 1 - control plaster (without water-repellent). Series 2 - plaster, to which the mi groups, having the formula (CH3)3Si-O-[Si(CH3)-OH]x-Si(CH3)3where h, and called RHOXIMAT N 68, in the form of pure oil. Series 3 - plaster, to which was added 0.1% of the mass of powder plaster RHOXIMAT H 68 in the form of pure oil. Series 4 corresponds to the plaster, to which was added 0.1% of the mass of powder plaster RHOXIMAT H 68 and 0.2% by weight of powder of plaster Guara RHOXIMAT RH 148 representing hydroxypropanoic with a molecular mass of approximately 1200000 and a molar degree of substitution of approximately 0.6. Regardless of the sample, the quantity of water added is such that the ratio of water to plaster remains always equal to 0.75. Preparation of Depending on the prepared sample to enter the water, polymethylhydrosiloxane (RHOXIMAT N 68) and guar (RHOXIMAT RH 148) in the glass. Stir 15 C. - Add for 15 with plaster and mix for 15 sec. To withstand 30 and again stirred for 30 sec. - Pour the plaster into the form, to condense, to level the surface and leave to set (duration about 30 minutes). After completion of the setting to retrieve samples of the plaster from the mold and dried for the Les extracted from the drying Cabinet designs enable spontaneously cooled to 23oC at a relative humidity of 65%. The samples are immersed in drinking water to a depth of approximately 1 cm and produce weighing every hour for 8 hours and then after 24 hours Expression of results The amount of absorbed water is expressed as % of dry mass of the sample at time t according to the following formula: , where E1the mass of the sample at time t=0; E2the mass of the sample at time t. Each product is tested on a series of three samples of plaster. The results given in Table I correspond to the average of the three trials and are within 2% of the score. Established stable (for at least 24 h) improving the hydrophobic properties of plaster, to which is added a reduced number RHOXIMAT N 68, Guara RHOXIMAT RH 148. From table. 1 it is clear that a simple decrease in the number N in the absence of hydroxypropylamino does not produce the desired hydrophobic properties. Example 2 Equipment In this example, the equipment, as well as the sequence of operations are the same as in example 1. Materials Prepared four series of three specimens of plaster of 3600 g natural piece of the Sabbath. Series 2 - plaster, to which was added 0.5 percent by weight of plaster powder 60% emulsion of polymethylhydrosiloxane blocked at the end of the chain methyl groups having the formula (CH3)3Si-O-[SiH(CH3)-OH]x-Si(CH3)3where h, and called RHOXIMAT HD 879. Series 3 - plaster, which added to 0.17% by weight of powder of plaster RHOXIMAT HD 879. Series 4 corresponds to the plaster, which added to 0.17% by weight of powder of plaster 60% emulsion RHOXIMAT HD 879 and 0.2% by weight of powder of plaster Guara RHOXIMAT RH 148, also called RH 148 and representing hydroxypropanoic with a molecular mass of approximately 1200000 and a molar degree of substitution of approximately 0.6. Regardless of the sample, the quantity of water added is such that the ratio of water to plaster remains always equal to 0.75. Evaluation of the hydrophobic properties of samples After removal from the drying chamber the samples provide an opportunity to spontaneously cooled to 23oC at a relative humidity of 65%. The samples are immersed in drinking water to a depth of approximately 1 cm and produce weighing every hour for 6 hours and then after 24 hours Each with the t to the average of the 3 trials and are within 2% of the score. Established stable (for at least 24 h) improving the hydrophobic properties of plaster, to which is added, the emulsion RHOXIMAT HD 879 + RHOXIMAT RH 148. 1. Method of waterproofing plaster, characterized in that the powder plaster add at least one component (A) containing at least one alkylhydroperoxide and at least one hydrocolloid (C) containing at least one galactomannan. 2. The method according to p. 1, characterized in that plaster powder is mixed with at least one component (A) containing at least one alkylhydroperoxide at least one hydrocolloid (C) containing at least one galactomannan, and water. 3. The method according to PP.1 and 2, characterized in that the component (A) consists of at least one linear and/or cyclic alkylhydroperoxide described General formula (I) and (II): < / BR> < / BR> in which a and b are integers or fractional numbers, defined as A, mainly a; 0b500, mainly 1b100; 5A+b1000, mainly 10A+b150, c and d are integers or fractional numbers, defined as S, mainly s; 1d10, mainly 1d5 the natural radical with 1-8 carbon atoms, selected from normal or branched alkyl radicals, in particular methyl radicals, ethyl, propyl, isopropyl, tert-butyl, n-hexyl, n-octyl; unsaturated phenyl radicals which can be substituted by methyl and/or ethyl radical; when b>0, R2identical or different, denote a hydrogen atom and/or a monovalent hydrocarbon radical with 1-8 carbon atoms, selected from normal or branched alkyl radicals, in particular methyl radicals, ethyl, propyl, isopropyl, tert-butyl, n-hexyl, n-octyl; unsaturated phenyl radicals which can be substituted by methyl and/or ethyl radical; when b=0, at least one of the radicals R2is a hydrogen atom, while the remaining radicals R2identical or different, represent monovalent hydrocarbon radical with 1-8 carbon atoms, selected from normal or branched alkyl radicals, in particular methyl radicals, ethyl, propyl, isopropyl, tert-butyl, n-hexyl, n-octyl; unsaturated phenyl radicals which can be substituted by methyl and/or ethyl radical. 4. The method according to any of paragraphs.1-3, characterized in that the component (A) comprises at least one is further alkyl radicals, containing 1-3 carbon atoms, selected from the radicals methyl, ethyl and propyl, preferably methyl radical; a and b are integers or fractional numbers, defined as a, mainly a; 1b100, mainly 10b80; 10A+b150, mainly 20A+b100. 5. The method according to any of paragraphs. 1-4, characterized in that the component (A) consists of at least one linear alkylhydroperoxide with a viscosity of 200 mPas, preferably 5-50 mPas. 6. The method according to any of paragraphs.1-5, characterized in that alkylhydroperoxide (a) the percentage of links SiH 0.05 to 5, preferably 0.3 to 2% by weight of hydrogen relative to the weight of component (A). 7. The method according to any of paragraphs.1-6, characterized in that the component (A) consists of at least one alkylhydroperoxide in the form of butter. 8. The method according to any of paragraphs.1-7, characterized in that the quantity of the component (A) does not exceed 0,25%, preferably not greater than 0.15% by weight of powder of plaster. 9. The method according to any of paragraphs.1-8, characterized in that the hydrocolloid (C) is a nonionic guar, which at least part of the hydroxyl groups substituted hydroxyalkyl groups in which the alkyl contains guarav, hydroxypropylamino and hydroxybutyrate. 11. The method according to p. 9 or 10, characterized in that the molar degree of substitution of hydrocolloids (b) is at least 0,2-0,9, mainly 0,3-0,7. 12. The method according to any of paragraphs.1-11, characterized in that the molecular weight of hydrocolloid (C) varies from 50,000 to 2000000, mostly from 200000 to 1500000. 13. The method according to any of paragraphs.1-12, characterized in that the hydrocolloid (C) in the form of a 1% dispersion in water has a viscosity of not more than 1500 mPas, mainly 500-1100 mPas. 14. The method according to any of paragraphs.1-13, characterized in that the content of hydrocolloid (C) is 0.05 to 0.5, preferably 0.05 to 0.3, and even more preferably 0.10 to 0.25% by mass of powder of plaster. 15. The method according to any of paragraphs.1-14, characterized in that the plaster add-thinning and dispersing and/or foaming agent. 16. The method according to any of paragraphs.1-15, characterized in that the hydrocolloid (C) is a solid. 17. Method of waterproofing plaster, characterized in that the add plaster composition comprising at least one hydrocolloid In an amount of 0.05-0.5% by weight of powder of plaster that contains at events, at least part of the hydroxyl groups is substituted by hydroxyalkyl groups, where alkyl contains 2-4 carbon atoms, and at least one component (A) is present in an amount not exceeding 0.25% by weight of plaster powder, and containing at least one alkylhydroperoxide in the form of pure oil, diluted in solution, in emulsion or in the form capable of emulgirovanija concentrate. 18. Powder composition for waterproofing plaster containing at least one hydrocolloid (C) is present in quantities of 0.05-0.5% by weight of plaster powder containing at least one galactomannan, and specified hydrocolloid (C) is a nonionic guar, which at least part of the hydroxyl groups is substituted by hydroxyalkyl groups, where the alkyl groups contain 2-4 carbon atoms, and the solid is based on at least one supported on a carrier component (A) and component (A) is present in an amount not exceeding 0.25% from the mass of plaster powder, and contains at least one alkylhydroperoxide. 19. Molded product in the form of sheets or plates formed from plaster, gidrofobizirovannogo according to the method defined in any of paragraphs.1-17. 20. Product for hydrophobicities, and at least one hydrocolloid (C) containing at least one galactomannan, and hydrocolloid (C) is a nonionic guar, which at least part of the hydroxyl groups is substituted by hydroxyalkyl groups, where the alkyl contains 2-4 carbon atoms.
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